The Agri-Food and Veterinary Authority said in a statement late Thursday that it found small levels of contamination in samples of Japanese mustard, parsley and two other plants imported from the prefectures of Tochigi, Ibaraki, Chiba and Ehime.

The AVA said the levels of radioactive contamination were small enough that the short-term consumption of those foods wouldn't pose a health hazard.

The AVA said it added food imports from Chiba and Ehime to a ban already in place on the sale of milk, milk products, fruits, vegetables, seafood and meat from Fukushima, Ibaraki, Tochigi and Gunma prefectures.